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Title: Effects of various radiation source characteristics on shielding requirements at the potential Yucca Mountain repository

Abstract

This radiation shielding study provides dose rate information that can be used to estimate required shielding thicknesses for different repository configurations, including various hot cells and vaults in the waste-handling building, the boreholes in the underground emplacement area, and the transfer casks. The study determines gamma and neutron source strengths for various waste types and source geometries representative of conditions at the repository and determines dose rates as a function of shielding thickness for selected materials.

Authors:
;  [1];  [2]
  1. Bechtel National, Inc., San Francisco, CA (United States)
  2. Sandia National Labs., Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States); Bechtel National, Inc., San Francisco, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
138379
Report Number(s):
SAND-89-7008
ON: DE92010359; TRN: 92:014311
DOE Contract Number:
AC04-76DP00789
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Feb 1992
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; 36 MATERIALS SCIENCE; RADIOACTIVE WASTE FACILITIES; SHIELDING; GAMMA DETECTION; C CODES; NEUTRON DETECTION; A CODES; HIGH-LEVEL RADIOACTIVE WASTES; UNDERGROUND DISPOSAL; COMPILED DATA; RADIATION PROTECTION; DOSE RATES; HOT CELLS; BOREHOLES; CONCRETES; WASTE FORMS; GAMMA SOURCES; NEUTRON SOURCES; ATTENUATION; RADIOACTIVE WASTE PROCESSING; RADIOACTIVE WASTE DISPOSAL; PHYSICAL PROPERTIES; SOURCE TERMS; YUCCA MOUNTAIN; FUEL ASSEMBLIES; CONTAINERS; Yucca Mountain Project

Citation Formats

Smith, D.W., Miller, D.D., and Hill, R.R. Effects of various radiation source characteristics on shielding requirements at the potential Yucca Mountain repository. United States: N. p., 1992. Web. doi:10.2172/138379.
Smith, D.W., Miller, D.D., & Hill, R.R. Effects of various radiation source characteristics on shielding requirements at the potential Yucca Mountain repository. United States. doi:10.2172/138379.
Smith, D.W., Miller, D.D., and Hill, R.R. 1992. "Effects of various radiation source characteristics on shielding requirements at the potential Yucca Mountain repository". United States. doi:10.2172/138379. https://www.osti.gov/servlets/purl/138379.
@article{osti_138379,
title = {Effects of various radiation source characteristics on shielding requirements at the potential Yucca Mountain repository},
author = {Smith, D.W. and Miller, D.D. and Hill, R.R.},
abstractNote = {This radiation shielding study provides dose rate information that can be used to estimate required shielding thicknesses for different repository configurations, including various hot cells and vaults in the waste-handling building, the boreholes in the underground emplacement area, and the transfer casks. The study determines gamma and neutron source strengths for various waste types and source geometries representative of conditions at the repository and determines dose rates as a function of shielding thickness for selected materials.},
doi = {10.2172/138379},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1992,
month = 2
}

Technical Report:

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  • The Yucca Mountain Site Characterization Project is studying Yucca Mountain in southwestern Nevada as a potential site for a high-level nuclear waste repository. Site characterization includes surface-based and underground testing. Analyses have been performed to support the design of site characterization activities so to have minimal impact on the ability of the site to isolate waste, and on tests performed as part of the characterization process. Two examples of site characterization activities are the construction of an Exploratory Studies Facility, which may include underground shafts, drifts, and ramps, and surface-based testing activities, which may require borehole drilling, excavation of testmore » pits, and road watering for dust control. The information in this report pertains to two-dimensional numerical calculations modeling the movement of surficially applied water and the potential effects of that water on repository performance and underground experiments. This document contains information that has been used in preparing recommendations for two Yucca Mountain Site Characterization Project documents: Appendix I of the Exploratory Studies Facility Design Requirements document, and the Surface-Based Testing Field Requirements Document.« less
  • A comprehensive collection of scenarios is presented that connect initiating tectonic events with radionuclide releases by logical and physically possible combinations or sequences of features, events and processes. The initiating tectonic events include both discrete faulting and distributed rock deformation developed through the repository and adjacent to it, as well as earthquake-induced ground motion and changes in tectonic stress at the site. The effects of these tectonic events include impacts on the engineered-barrier system, such as container rupture and failure of repository tunnels. These effects also include a wide range of hydrologic effects such as changes in pathways and flowmore » rates in the unsaturated and saturated zones, changes in the water-table configuration, and in the development of perched-water systems. These scenarios are intended go guide performance-assessment analyses and to assist principal investigators in how essential field, laboratory, and calculational studies are used. This suite of scenarios will help ensure that all important aspects of the system disturbance related to a tectonic scenario are captured in numerical analyses. It also provides a record of all options considered by project analysts to provide documentation required for licensing agreement. The final portion of this report discusses issues remaining to be addressed with respect to tectonic activity. 105 refs.« less
  • This study recommends which structures, systems, and components of the potential repository at Yucca Mountain are important to safety. The assessment was completed in April 1990 and uses the reference repository configuration in the Site Characterization Plan Conceptual Design Report and follows the methodology required at that time by DOE Procedure AP6.10-Q. Failures of repository items during the preclosure period are evaluated to determine the potential offsite radiation doses and associated probabilities. Items are important to safety if, in the event they fail to perform their intended function, an accident could result which causes a dose commitment greater than 0.5more » rem to the whole body or any organ of an individual in an unrestricted area. This study recommends that these repository items include the structures that house spent fuel and high-level waste, the associated filtered ventilation exhaust systems, certain waste- handling equipment, the waste containers, the waste treatment building structure, the underground waste transporters, and other items listed in this report. This work was completed April 1990. 27 refs., 7 figs., 9 tabs.« less
  • The design of the potential Yucca Mountain repository is subject to many thermal goals related to the compliance of the site with federal regulations. This report summarizes a series of sensitivity studies that determined the expected temperatures near the potential repository. These sensitivity studies were used to establish an efficient loading scheme for the spent fuel canisters and a maximum areal power density based strictly on thermal goals. Given the current knowledge of the site, a design-basis areal power density of 80 kW/acre can be justified based on thermal goals only. Further analyses to investigate the impacts of this design-basismore » APD on mechanical and operational aspects of the potential repository must be undertaken before a final decision is made.« less
  • The Yucca Mountain Site Characterization Project is studying Yucca Mountain in southwestern Nevada as a potential site for a high-level nuclear waste repository. Site characterization includes surface-based and underground testing. Analyses have been performed to design site characterization activities with minimal impact on the ability of the site to isolate waste, and on tests performed as part of the characterization process. One activity of site characterization is the construction of an Exploratory Studies Facility, consisting of underground shafts, drifts, and ramps, and the accompanying surface pad facility and roads. The information in this report addresses the following topics: (1) amore » discussion of the potential effects of surface construction water on repository-performance, and on surface and underground experiments; (2) one-dimensional numerical calculations predicting the maximum allowable amount of water that may infiltrate the surface of the mountain without affecting repository performance; and (3) two-dimensional numerical calculations of the movement of that amount of surface water and how the water may affect repository performance and experiments. The results contained herein should be used with other site data and scientific/engineering judgement in determining controls on water usage at Yucca Mountain. This document contains information that has been used in preparing Appendix I of the Exploratory Studies Facility Design Requirements document for the Yucca Mountain Site Characterization Project.« less